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| Site of Special Scientific Interest | |
  Location within Wales | |
| Area of Search | Wales |
|---|---|
| Grid reference | SS9285196797 |
| Coordinates | 51°39′35″N3°33′02″W / 51.659709°N 3.5504665°W Coordinates: 51°39′35″N3°33′02″W / 51.659709°N 3.5504665°W |
| Interest | Biological |
| Area | 323.88 ha |
| Notification | 1 January 1972 |
Mynydd Ty-Isaf, Rhondda is a Site of Special Scientific Interest near Treherbert in Rhondda Cynon Taf, south Wales.
A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle of Man. SSSI/ASSIs are the basic building block of site-based nature conservation legislation and most other legal nature/geological conservation designations in the United Kingdom are based upon them, including national nature reserves, Ramsar sites, Special Protection Areas, and Special Areas of Conservation. The acronym "SSSI" is often pronounced "triple-S I".
Treherbert is a village and community situated at the head of the Rhondda Fawr valley in the county borough of Rhondda Cynon Taf, Wales. Historically part of Glamorgan, Treherbert is a former industrial coal mining village which was at its economic peak between 1850 and 1920. Treherbert is the upper most community of the Rhondda Fawr and encompasses the districts of Blaencwm, Blaenrhondda, Tynewydd and Pen-yr-englyn.
Rhondda Cynon Taf, or informally RCT, is a county borough in the south of Wales. It consists of five valleys: the Rhondda Fawr and Fach, Cynon, Taff and Ely valleys, plus a number of towns and villages away from the valleys. Results from the 2011 census showed 19.1% of its 234,410 residents self-identified themselves as having some ability in the use of the Welsh language.
